January 12, 2006 at 4:24 pm #41990
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I just came across a formula to determine frequency while sampling
the formla is k = ( critical specification – process average ) / Sp
where Sp = process variability
now its a little bit complicated how we calculate Sp
Sp = sqrt ( S ^ 2 pcl – S^2t)
S^pcl = = MR bar / 1.128
but i am not able to understand what is S^2t.
Can some one explain me this formula. Its in the book six sigma and beyond vol 4 Chapter 7.
0January 12, 2006 at 4:35 pm #132301
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